Envelop.



1 F. L. NORMAN.

ENVBLOP.

APPLICATION IILED MBA, 1910.

960,38 Patented June7, 1910.

INVENTOR FRED. L. NORMAN ATTORNEYS WITNESS 7 ANDREW B. GRAHAM O0 PHOTO-WHERE. WASWNOIOR. D.

' width of the edge members.

oNirn s ATS FREDERICK L. NORMAN, OF BALTIMORE, MARYLAND, ASSIGNOR OF ONE-HALF TO HERMAN BEALMEAR, OF BALTIMORE, MARYLAND.

ENVELOP.

To all whom it may concern:

Be it known that I, FREDERICK L. NORMAN, a citizen of the United States of America, residing at the city of Baltimore, State of Maryland, have invented certain new and useful Improvements in Envelops, of which the following is a specification.

This invention relates to receptacles of paper and similar material and particularly to envelops which are adapted to hold articles of rectangular shape having three dimensions of appreciable extent, as books, small boxes, etc.

The envelop which is the subject of my invention is formed of a single piece of material; in its normal condition is a receptacle of three dimensions and is particularly adapted to contain rectangularly shaped articles of appreciable thickness. It is so formed that the third dimension is varied automatically to suit the size of the contained article and when empty collapses completely under pressure so that the third dimension is eliminated and it becomes fiat as are the envelops in common use.

In the sided receptacle which I am describing, there are four edge members and four flaps. The edge members connect the flaps to the back. Outwardly disposed creases separate each edge member from the corresponding flap and from the back. These creases form the edges proper of the envelop. Between the edge creases or edges proper each edge member is folded preferably inward so as to form a crease between, parallel and oppositely disposed to the edge creases. The edge members are creased as described to have a bellows action so that the distance between the front and back of the envelop may be contracted and expand ed to correspond to the thickness of the article contained in the envelop.

An important feature of my invention is the corner closure. Between each pair of adjacent front flaps is a corner fiap preferably square having its sides equal to the These corner flaps as shown are folded diagonally and the diagonally folded flap is again folded to conform to one bellows fold so that it has two creases which meet at its center forming continuations of the central creases of the adjacent edges. The corner flap thus formed reinforces the corners of the envelop and serves to make the back and edge portions Specification of Letters Patent.

Application filed February 4, 1910.

Patented June 7, 1910.

Serial No. 542,019.

continuous at these points. The outer edges of the corner flaps are brought together when it is folded diagonally and when the front flaps are folded over each other closing the envelop, these edges are pressed against the front flaps forming an exceedingly tight and permanent joint.

An envelop and envelop blank made in accordance with my invention, are shown in the accompanying drawings.

Figure 1 is a perspective of the envelop.

Fig. 2 is a plan of the blank showing the.

creases in dotted lines. Fig. 3 is a fragmentary view of a corner the flaps being broken away to reveal the corner fold. Fig. 4c is a section on lines 4 4: and r l of Fig. 2 showing the creased blank. I

The envelop as shown in Fig. 1 has a fiat front 1, flat back 2 and inwardly folded bellows, edges or sides 3-l. The blank of which this envelop is formed is preferably cut from a single piece of material as shown in Fig. 2 and is creased either when formed or subsequently in accordance with the dotted lines in that figure. The blank as thus formed consists of a back portion 2, front flaps 55 66 one corresponding to each side of the back portion 2, edge portions 3-8 and l4c connecting the front flaps to the corresponding sides of the back 2 and corner flaps 7 between the adjacent front flaps. These latter are preferably square and have their sides of dimensions equal to the width of the edge members 3-4. The edge members as shown are defined or separated each from its corresponding flap and from the adjacent side of the back by edge creases 8, though it is within the scope of my invention to omit these creases and roll or bend the paper at this point. The edge creases 8 defining each edge portion are shown as parallel to each other and between each pair of parallel creases is a third crease 9 preferably parallel to the other two and oppositely disposed so that the edge portions are turned inward bellows wise. The inner creases 8 which define the back 2 are preferably extended beyond the back proper so that they also define the corner flaps 7 In the case of the rectangular envelop, these corner flaps, as has been previously stated, are square and creased so as to be folded inward on the diagonal 10.

In forming the envelop the blank as shown in Fig. 2 is first folded on the inner creases 8 to form a receptacle having a flat bottom 2 and four side walls. The corner flaps 7 which are creased diagonally at 10' are then infolded and when thus folded they are again folded to conform to the ends of the bellows creases 9. To provide for this the corner flaps are preferably creased at 11 to form prolongations of the bellows creases 9. In the envelop shown the corner flaps are folded about the creases 9 on the long side. This is a matter of choice with the manufacturer. When thus folded the short edge portions 3 are creased atl2l2 to provide for the extremity of the bellows fold of the long edge. The front flaps 55 66 are now folded in to form the flat front sur face 1 and these flaps may be pasted or not in accordance with the degree of permanency desired.

I have thus described a single embodiment of my invention in specific terms in order that it may be easily understood, but these terms are used in their generic sense and not for purpose of limitation.

The scope of the invention is set forth in the following claims:

1. A bellows fold envelop having a back,

four front flaps, edge portions connecting each flap tothe back and creased longitudi nally and corner flaps between the front.

flaps, the corner flaps folded diagonally and when thusfolded being again creased to conform to the longitudinal creases of the edge portions.

2. An envelop having a back portion and front flap for each side of the back portion, an edge portion connectingeach flap to the back, each edge portion being separated from the adjacent front flap and from the back portion by parallel creases and creased intermediately, the latter crease parallel to the other two and oppositely disposed and infolded corner flaps at the endsof the edge portions, the folds in the corner flaps being diagonal and thecorner flaps as thus formed being again foldedto conform to the intermediate creases.

Signed by me at Baltimore, Maryland, this 1st day of February 1910.

FREDERICK NORMAN.

Witnesses:

EDWARD L. BASH, JOSEPH B. BEAM. 

